User's Manual
Amazon Modem Module
Development Kit User Manual
Ver1.1 7/26/2010
Figure 3-15 Send AT command
Reference AT commands are as following:
1. Auto-search Network: AT+COPS=0
2. Make a circuit-switch call to instrument: ATD123456; (Do not miss the semicolon.)
3. In case, if SIM is locked by PIN number (e.g., 0000), use AT+CPIN=”0000” to unlock
SIM PIN. Before unlock, the SIM PIN Lock will also cause ERROR when issuing
AT+COPS=0. (Use AT+CPIN? to query the PIN status if you are not sure the SIM
requires PIN or not.)